hi, i want this name www.aaa.xxxx.yyyy.zz. Is correct to use these CNAME for this domain xxxx.yyyy.zz ? ex: www.aaa 172800 IN CNAME xxxx.yyyy.zz www.bbb 172800 IN CNAME xxxx.yyyy.zz www.ccc 172800 IN CNAME xxxx.yyyy.zz www.ddd 172800 IN CNAME xxxx.yyyy.zz